[PATCH v4 0/3] rust: platform: add Io support

[Daniel Almeida <daniel.almeida@collabora.com>]

Changes in v4:

- Rebased on top of driver-core-next
- Split series in multiple patches (Danilo)
- Move IoMem and Resource into its own files (Danilo)
- Fix a missing "if exclusive {...}" check (Danilo)
- Fixed the example, since it was using the old API (Danilo)
- Use Opaque in `Resource`, instead of NonNull and PhantomData (Boqun)
- Highlight that non-exclusive access to the iomem might be required in some cases
- Fixed the safety comment in IoMem::deref()

Link to v3: https://lore.kernel.org/rust-for-linux/20241211-topic-panthor-rs-platform_io_support-v3-1-08ba707e5e3b@collabora.com/

Changes in v3:
- Rebased on top of v5 for the PCI/Platform abstractions
- platform_get_resource is now called only once when calling ioremap
- Introduced a platform::Resource type, which is bound to the lifetime of the
  platform Device 
- Allow retrieving resources from the platform device either by index or
  name
- Make request_mem_region() optional
- Use resource.name() in request_mem_region
- Reword the example to remove an unaligned, out-of-bounds offset
- Update the safety requirements of platform::IoMem

Changes in v2:
- reworked the commit message
- added missing request_mem_region call (Thanks Alice, Danilo)
- IoMem::new() now takes the platform::Device, the resource number and
  the name, instead of an address and a size (thanks, Danilo)
- Added a new example for both sized and unsized versions of IoMem.
- Compiled the examples using kunit.py (thanks for the tip, Alice!)
- Removed instances of `foo as _`. All `as` casts now spell out the actual
  type.
- Now compiling with CLIPPY=1 (I realized I had forgotten, sorry)
- Rebased on top of rust-next to check for any warnings given the new
  unsafe lints.

Daniel Almeida (3):
  rust: io: add resource abstraction
  rust: io: mem: add a generic iomem abstraction
  rust: platform: allow ioremap of platform resources

 rust/bindings/bindings_helper.h |   1 +
 rust/helpers/io.c               |  17 +++++
 rust/kernel/io.rs               |   3 +
 rust/kernel/io/mem.rs           | 108 ++++++++++++++++++++++++++++++++
 rust/kernel/io/resource.rs      |  49 +++++++++++++++
 rust/kernel/platform.rs         |  98 ++++++++++++++++++++++++++++-
 6 files changed, 275 insertions(+), 1 deletion(-)
 create mode 100644 rust/kernel/io/mem.rs
 create mode 100644 rust/kernel/io/resource.rs

-- 
2.47.1